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Thanks Bob & Rick I believe the pistons were from a Dodge "Q" & are not
dished, they are level with the top of the block
They were fitted long before I bought the car & after rebuild I had to fit
a high torque starter to get it to turnover
>From your assessments & my assumptions I thought compression would be
higher than 9.5 possibly 10+
The car certainly has plenty of torque It also had an ugly/bizarre
plumbing setup to the head similar to a 100S for cooling
Curiosity satisfied
Keith
On 16 January 2016 at 12:57, Wilko2 <e-wilkins@cox.net> wrote:
> The standard 7.5/1 piston has a dish top with a volume of 29 cc.
>
> The LeMans 8.5/1 piston also has a dish top but the dish is not as deep
> being only 14cc volume. A true flat top if it has the same compression
> height (distance from the top of the pin hole to top of piston) would give
> a ratio of 10.5/1. There could be design variations that are flat top but
> have a lower compression height which would give a lower ratio.
>
> Without knowing where the top of your piston is in relation to the top of
> the cylinder or dimension from pin, there's not way of knowing without
> measuring your chambers.
>
> Rick Wilkins
>
> On Jan 15, 2016, at 5:10 PM, Keith Taylor wrote:
>
> > What would be the compression ratio of a BN2 fitted with flat top
> pistons.
> >
> > Keith Taylor
> > BN1
> > BN2
> >
> > Southern Highlands OZ
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>
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<div dir=3D"ltr"><div>Thanks Bob & Rick=C2=A0 I believe the pistons wer=
e from a Dodge "Q" & are not dished, they are level with the =
top of the block</div><div>They were fitted long before I bought the car &a=
mp; after rebuild I had to fit a high torque starter to get it to turnover =
</div><div>From your assessments & my assumptions I thought compression=
would be higher than 9.5 possibly 10+</div><div>The car certainly has plen=
ty of torque=C2=A0=C2=A0It also had an ugly/bizarre plumbing setup to the h=
ead similar to a 100S for cooling=C2=A0</div><div><br></div><div>Curiosity =
satisfied </div><div><br></div><div>Keith</div></div><div class=3D"gmail_ex=
tra"><br><div class=3D"gmail_quote">On 16 January 2016 at 12:57, Wilko2 <sp=
an dir=3D"ltr"><<a href=3D"mailto:e-wilkins@cox.net"; target=3D"_blank">e=
-wilkins@cox.net</a>></span> wrote:<br><blockquote class=3D"gmail_quote"=
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Th=
e standard 7.5/1 piston has a dish top with a volume of 29 cc.<br>
<br>
The LeMans 8.5/1 piston also has a dish top but the dish is not as deep bei=
ng only 14cc volume. A true flat top if it has the same compression height =
(distance from the top of the pin hole to top of piston) would give a ratio=
of 10.5/1. There could be design variations that are flat top but have a l=
ower compression height which would give a lower ratio.<br>
<br>
Without knowing where the top of your piston is in relation to the top of t=
he cylinder or dimension from pin, there's not way of knowing without m=
easuring your chambers.<br>
<br>
Rick Wilkins<br>
<div><div class=3D"h5"><br>
On Jan 15, 2016, at 5:10 PM, Keith Taylor wrote:<br>
<br>
> What would be=C2=A0 the compression ratio of a BN2 fitted with flat to=
p pistons.<br>
><br>
> Keith Taylor<br>
> BN1<br>
> BN2<br>
><br>
> Southern Highlands OZ<br>
</div></div><span>> _______________________________________________<br>
> Support Team.Net <a href=3D"http://www.team.net/donate.html"; target=3D=
"_blank" rel=3D"noreferrer">http://www.team.net/donate.html</a><br>
> Suggested annual donation=C2=A0 $12.75<br>
> Archive: <a href=3D"http://www.team.net/archive"; target=3D"_blank" rel=
=3D"noreferrer">http://www.team.net/archive</a><br>
> Forums: <a href=3D"http://www.team.net/forums"; target=3D"_blank" rel=
=3D"noreferrer">http://www.team.net/forums</a><br>
><br>
> <a href=3D"mailto:Healeys@autox.team.net";>Healeys@autox.team.net</a><b=
r>
> <a href=3D"http://autox.team.net/mailman/listinfo/healeys"; target=3D"_=
blank" rel=3D"noreferrer">http://autox.team.net/mailman/listinfo/healeys</a=
><br>
><br>
</span>> Unsubscribe/Manage: <a href=3D"http://autox.team.net/mailman/op=
tions/healeys/e-wilkins@cox.net" target=3D"_blank" rel=3D"noreferrer">http:=
//autox.team.net/mailman/options/healeys/e-wilkins@cox.net</a><br>
><br>
<br>
</blockquote></div><br></div>
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